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Displaying 776 - 800 of 871

Low Noise Amplification of a Continuous Variable Quantum State

June 29, 2009
Author(s)
Raphael C. Pooser, Alberto M. Marino, Vincent Boyer, Kevin M. Jones, Paul D. Lett
We present an experimental realization of a low-noise, universal, phase-insensitive optical amplifier using four-wave mixing interaction in hot Rb vapor. Performance near the quantum limit for a range of amplifier gains, including near unity, can be

Experimental Uhrig Dynamical Decoupling Using Trapped Ions

June 25, 2009
Author(s)
Michael J. Biercuk, Hermann Uys, Aaron Vandevender, Nobuyasu Shiga, Wayne M. Itano, John J. Bollinger
We present a detailed experimental study of the Uhrig Dynamical Decoupling (UDD) sequence in a variety of noise environments. Our qubit system consists of a crystalline array of 9Be + ions confined in a Penning trap. We use an electron-spin-flip transition

Vacuum-Gap Capacitors for Low-Loss Superconducting Resonant Circuits

June 16, 2009
Author(s)
Katarina Cicak, Michael S. Allman, Joshua Strong, Kevin Osborn, Raymond W. Simmonds
Low-loss microwave components are used in many superconducting resonant circuits from multiplexed readouts of low-temperature detector arrays to quantum bits. Two-level system (TLS) defects in amorphous dielectric materials cause excess energy loss. In an

High-brightness, low-noise, all-fiber photon pair source

June 4, 2009
Author(s)
Shellee D. Dyer, Burm Baek, Sae Woo Nam
We demonstrate an all-fiber photon pair source for the critical telecom C-band. We achieve high pair generation rates in excess of 10 MHz while maintaining coincidence-to-accidental ratios (CARs) greater than 100. This is one of the brightest and lowest

Application of the Josephson effect in electrical metrology

June 1, 2009
Author(s)
Samuel P. Benz, Blaise Jeanneret
Over the last 30 years, metrology laboratories have used the quantum behavior of the Josephson effect to greatly improve voltage metrology. The following article reviews the history and present status of the research and development Josephson voltage

Generation of optical Schrodinger cat states by number-resolved squeezed photon subtraction

May 31, 2009
Author(s)
Thomas Gerrits, Scott C. Glancy, Tracy S. Clement, Brice R. Calkins, Adriana E. Lita, Aaron J. Miller, Alan L. Migdall, Sae Woo Nam, Richard P. Mirin, Emanuel H. Knill
We have generated and measured an approximation of an optical Schrödinger cat state by photon subtraction from a squeezed state. Using single-photon avalanche photodiode detectors and photon-number-resolving transition edge sensors, we were able to extract

Third- and fourth-order coherences measured with a multi-element superconducting nanowire single-photon detector

May 29, 2009
Author(s)
Martin J. Stevens, Burm Baek, Eric Dauler, Andrew J. Kerman, Richard J. Molnar, Scott A. Hamilton, Karl Berggren, Richard P. Mirin, Sae Woo Nam
We demonstrate a technique for measuring third- and fourth-order coherences using a multi-element detector consisting of four independent, interleaved superconducting nanowire single-photon detectors, and observe strong bunching from a chaotic light source

High Speed Quantum Key Distribution over Optical Fiber Network System

May 28, 2009
Author(s)
Xiao Tang, Lijun Ma, Alan Mink
NIST has developed a number of complete fiber-based high-speed quantum key distribution QKD)systems that includes an 850 nm QKD system for a local area network (LAN), a 1310 nm QKD system for a metropolitan area network (MAN), and a 3-node quantum network

Generation of GKP states with optical states

May 11, 2009
Author(s)
Scott C. Glancy, Hilma M. Vasconcelos, Liliana Sanz
Classical information can be carried by either a discrete signal or by a continuous signal. Quantum information can also be carried by a discrete, finite-dimensional system, such as a two-level atom or an electron spin, or by continuous, infinite

Single-photon Sources

May 1, 2009
Author(s)
Matthew T. Rakher
Quantum-dot-based single-photon sources are fast and efficient and remain at the forefront of candidates for use in quantum information schemes.

1310 nm Differential Phase Shift QKD System Using Superconducting Single Photon Detectors

April 30, 2009
Author(s)
Xiao Tang, Lijun Ma, Sae Woo Nam, Burm Baek, Oliver T. Slattery, Alan Mink, Hai Xu, Tiejun Chang
We have implemented a differential-phase-shift (DPS) quantum key distribution (QKD) system at 1310 nm with superconducting single photon detectors (SSPD). The timing jitter of the SSPDs is small and its dark counts are very low. 1310 nm is an ideal quantum

Practical long-distance quantum key distribution system using decoy levels

April 30, 2009
Author(s)
Danna Rosenberg, Charles G. Peterson, Jim A. Harrington, Patrick R. Rice, N. Dallman, K. T. Tyagi, K. P. McCabe, Sae Woo Nam, Burm Baek, Robert Hadfield, Richard J. Hughes, Jane E. Nordholt
Quantum key distribution (QKD) has the potential for widespread real-world applications, but no secure long-distance experiment has demonstrated the truly practical operation needed to move QKD from the laboratory to the real world due largely to

Programmable Instrumentation & GHz Signaling for Quantum Communication Systems

April 30, 2009
Author(s)
Alan Mink, Joshua C. Bienfang, Robert J. Carpenter, Lijun Ma, Barry J. Hershman, Alessandro Restelli, Xiao Tang
We discussed custom instrumentation for high-speed single photon metrology. We focus on the difficulty of GHz data sampling and provide some techniques on how to accomplish it. We also discuss the benefits of field programmable gate arrays as the basis for

Electromagnetically induced transparency in a superconducting three-level system

April 16, 2009
Author(s)
Mika Sillanpaa, Katarina Cicak, Fabio Altomare, Jae Park, Raymond Simmonds, Jian Li, G. S. Paraoanu, Pertti Hakonen
When a three-level quantum system is irradiated by an intense coupling field resonant with two of the three possible transitions, the resonant absorption of the system from its ground state by an additional radiation field is suppressed. This effect, where

Improved implementation of the Alicki Van Ryn nonclassicality test for a single particle using Si detectors

April 15, 2009
Author(s)
Sergey V. Polyakov, Alan L. Migdall, Giorgio Brida, Ivo P. Degiovanni, Marco Genovese, Fabrizio Piacentini, V Schettini, Nicolas Gisin
Recently a test of nonclassicality for a single qubit was proposed R. Alicki and N. Van Ryn, J. Phys, A: Math. Theor. 41, 062001 2008. We present an optimized experimental realization of this test leading to a 46standard deviation violation of classicality

Quantum Resistant Public Key Cryptography: A Survey

April 14, 2009
Author(s)
Ray A. Perlner, David A. Cooper
Public key cryptography is widely used to secure transactions over the Internet. However, advances in quantum computers threaten to undermine the security assumptions upon which currently used public key cryptographic algorithms are based. In this paper

Restrictions on Transversal Encoded Quantum Gate Sets

March 18, 2009
Author(s)
Bryan K. Eastin, Emanuel H. Knill
Transversal gates play an important role in the theory of fault-tolerant quantum computation due to their simplicity and robustness to noise. By definition, transversal operators do not couple physical subsystems within the same code block. Consequently

Generating correlated (2+1)-photon pairs in an active-Raman-gain medium

March 5, 2009
Author(s)
Lu Deng, Cuiping Lu, Weiping Zhang, Chunhua Yuan
A scheme of generating controllable 2+1 photons in a double- atomic system based on active Raman gain is presented in this paper. Such 2+1 photons can be a potential candidate to generate a correlated photon pair as one photon of “2” photons acts as a

Tunable Delay of Einstein-Podolsky-Rosen Entanglement

February 18, 2009
Author(s)
Alberto M. Marino, Raphael C. Pooser, Vincent Boyer, Paul D. Lett
Entanglement is an important quantum resource which displays correlations between two subsystems that are stronger than the ones that can be obtained classically. This makes it the basis for a number of applications, such as quantum information processing
Displaying 776 - 800 of 871